Measurement of the photodissociation coefficient of NO2 in the atmosphere. II - Stratospheric measurements

The photodissociation coefficient of NO2, J(NO2), has been measured from a balloon platform in the stratosphere. Results from two balloon flights are reported. High sun values of J(NO2) measured were 10.5 + or - 0.3 and 10.3 + or - 0.3 x 10 to the -3rd per sec at 24 and 32 km, respectively. The decrease in J(NO2) at sunset was monitored in both flights. The measurements are found to be in good agreement with calculations of J(NO2) using a simplified isotropic multiple scattering computer routine.